Key Topic 3: Frequency and Wavelength

Question 1

8-3A1: Frequencies generally used for marine RADAR are in the ___ part of the radio spectrum.

A. UHF
B. EHF
C. SHF
D. VHF

Answer 1

C. SHF

Question 2

8-3A2: Practical RADAR operation requires the use of microwave frequencies so that:

A. Stronger target echoes will be produced.
B. Ground clutter interference will be minimized.
C. Interference to other communication systems will be eliminated.
D. Non-directional antennas can be used for both transmitting and receiving.

Answer 2

A. Stronger target echoes will be produced.

Question 3

8-3A3: An S-band RADAR operates in which frequency band?

A. 1 - 2 GHz.
B. 4 - 8 GHz.
C. 8 - 12 GHz.
D. 2 - 4 GHz.

Answer 3

D. 2 - 4 GHz.

Question 4

8-3A4: A RADAR operating at a frequency of 3 GHz has a wavelength of approximately:

A. 1 centimeter.
B. 10 centimeters.
C. 3 centimeters.
D. 30 centimeters.

Answer 4

B. 10 centimeters.

Question 5

3-3A5: The major advantage of an S-band RADAR over an X-band RADAR is:

A. It is less affected by weather conditions.
B. It has greater bearing resolution.
C. It is mechanically less complex.
D. It has greater power output.

Answer 5

A. It is less affected by weather conditions.

Question 6

3-3A6: An X-band RADAR operates in which frequency band?

A. 1 - 2 GHz.
B. 2 - 4 GHz.
C. 4 - 8 GHz.
D. 8 - 12 GHz.

Answer 6

D. 8 - 12 GHz.